package com.lingyl.gulimall.product.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lingyl.common.utils.PageUtils;
import com.lingyl.common.utils.Query;
import com.lingyl.gulimall.product.dao.CategoryDao;
import com.lingyl.gulimall.product.entity.CategoryEntity;
import com.lingyl.gulimall.product.service.CategoryBrandRelationService;
import com.lingyl.gulimall.product.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    private CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        // 查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        // 组装成父子树形结构
        // 找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity -> {
                return  categoryEntity.getParentCid() == 0;
             })
            .map(menu -> {
                menu.setChildren(getChildrens(menu, entities));
                return menu;
            }).sorted((menu1,menu2) -> {
                return (menu1.getSort() == null ? 0: menu1.getSort()) - (menu2.getSort() == null ? 0: menu2.getSort());
            }).collect(Collectors.toList());


        return level1Menus;
    }

    @Override
    public void removeMenyByIds(List<Long> asList) {
        // TODO: 2021/1/25/025  当前删除的菜单，是否被别的地方引用
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);
        return parentPath.toArray(new Long[parentPath.size()]);
    }

    /**
     * 级联更新
     * @param category
     */
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }

    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        // 收集当前节点id
        paths.add(catelogId);
        CategoryEntity categoryEntity = this.getById(catelogId);
        if (categoryEntity.getParentCid() != 0){
            findParentPath(categoryEntity.getParentCid(), paths);
        }
        return paths;
    }

    /**
     * @Description: 递归查询当前菜单的子菜单
     * @Author Alan.lingyl
     * @Date 2021/1/22/022 11:20
     * @param root 1
     * @param all 2
     * @return java.util.List<com.lingyl.gulimall.product.entity.CategoryEntity>
     */
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid().longValue() == root.getCatId().longValue();
        }).map(categoryEntity -> {
            // 找子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            // 菜单的排序
            return (menu1.getSort() == null ? 0: menu1.getSort()) - (menu2.getSort() == null ? 0: menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

}